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|United States Patent||6,952,516|
|Takahashi , et al.||October 4, 2005|
A low attenuation optical fiber which falls within 2-14 ps/nm/km in absolute value of dispersion over the full wavelength range of 1530-1565 nm and no more than 0.25 dB/km of transmission loss at 1550 nm of wavelength at ordinary temperature and relative humidity, and still remains no more than 0.25 dB/km of transmission loss at 1550 nm or 1520 nm after its being long-enough exposed under ordinary atmospheric pressure consisting substantially of hydrogen; and which further comprises a polarization mode dispersion (PMD) of no more than 0.5 ps/√km at a wavelength of 1550 nm and a loss increase of no more than 40 dB/m in a bending diameter of 20 mm.
|Inventors:||Takahashi; Fumio (Tokyo, JP), Tamura; Jun-ichi (Tokyo, JP), Iino; Akira (Tokyo, JP)|
The Furukawa Electric Co., Ltd.
|Filed:||July 8, 2004|
|Application Number||Filing Date||Patent Number||Issue Date|
|Feb 27, 2001 [JP]||2001-052971|
|Current U.S. Class:||385/123 ; 385/124; 385/126|
|Current International Class:||G02B 6/036 (20060101); G02B 6/02 (20060101); G02B 006/16 ()|
|Field of Search:||385/123-128,141-145 65/424,426|
|6687444||February 2004||Antos et al.|
|6704485||March 2004||Campion et al.|
|6782173||August 2004||Takahashi et al.|
|2002/0051612||May 2002||Shimizu et al.|
|2004/0047576||March 2004||Kurusu et al.|
|0 283 748||Sep., 1988||EP|
|0 673 895||Sep., 1995||EP|
|1 030 199||Aug., 2000||EP|
|1 202 086||May., 2002||EP|
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